Having said that installing this MOD to any existing GTR2 no matter how modded is 100% safe to test
Any conflicts or errors you can restore in one click, however, realize you will get no overwrite warnings

I highly recommend Essentials Advanced method gives you more flexibility

PREPARATION:

*** SOME PACKAGES HAVE BEEN RENAMED OR REMOVED
*** BACKUP ALL YOUR OWN MODIFIED JSGME MODS
*** DE-ACTIVATE ALL MODS IN ALL GTR2 FOLDERS
*** DELETE ALL MODS and MODS INFO folders IN ALL GTR2 FOLDERS
*** READING the GTR2 ESSENTIALS TUTORIALS is Essential !

WARNING:

REMEMBER ! Soon as you do ANY MANUAL INSTALLS to any GTR folders that use ESSENTIALS you will have TROUBLES !

EXAMPLE:

You install a mod manually that overwrites some files from a already installed JSGME package
Sometime later you de-active the JSGME Mod that was manually overwritten
JSGME will give you no warning and replace the files with the original backup
So your manually installed mod will now more then likely be corrupted

Anything you want to add PACKAGE it for JSGME !
Then you will avoid situation described above

*** Read 100 CAR GDB PACK v1.8 by DurgeDriven in MODS INFO before you activate MOD
*** NoGrip Links for All ADD-ON TRACKS used are included in the corresponding track folder
*** Included GDBs for VLM tracks don't have uploads at NoGrip Racing, links are not included